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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55937d8ac0d3483e6b7d1269b5fbe1b20c280afc82d15a9f2ef0e7e09ea282c' 
  AND token = 'LeoAlyWPyuyDeye+VDhMpQJQXqJgrma4PKWQ7bON3vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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