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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85d5bce8a11bf8f6f7b221d024ee921fc33a2f91f2c13badd4e8e53ce5cd1ae' 
  AND token = 'ShVqkfHAhUmfn5Iirhsf7VGoK10yXRWw8k9uD7oqHXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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