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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1747c102ef69d6e497db91218e62547bda48751966eddd7ffd378a0a48a935' 
  AND token = 'yl4X+nC1c+KfO1dpcF4Mo/vS5eX+k/j8sUI3HxxO8+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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