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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c786f85c0fa5cb208f0520cee3364563c75461df91802bc07a87e42b54cbb4' 
  AND token = '7En5y9Lu7CM2RFD6Edpzj/VTU3bwv3UCuKxUb6mjOUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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