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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5d6d28e43482ceee2d485415398a69f780a2b995381ab9baa570b7410776a5' 
  AND token = 'I8+3lpdS/q290zmmWgSqK6CRfhr1q7NW5/o/RLvCm7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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