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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598f8a11f3064d41350a85e410748e916637be5cfc4690dd70a78fc88eadcbf0' 
  AND token = '8yynONOqkZOKUhcdFn+UORHAWILip0Az987PxnPB04s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}