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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb71c46f3ecaca3d937c52b7c12846fa368c9ed2b57970c40ac5bfe2eafb9014' 
  AND token = 'bO4IKNJ0UUJNam67lNCKfnCBL4yBaZCwXAaiZmIhsFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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