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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f204da7b595e9bcc4115b1e6132f0b2094e4aad0e6e8e9adc3fa566be138c23' 
  AND token = 'LCtZvzCeozxtT9LcRnoK4PUqcdYFl7ue5T0QIkKr9G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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