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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6dc66a47e7579cb0df8e02b2abeb26d6545e337891bc94aedda18e09df4bdd1' 
  AND token = 'cnGHjX0VvOFdLrQ6MYOqp4uXAdBEecsI1ctsIEX0ouE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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