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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f672c30223b29b111176031a273f0c98166246fb11f05ec2bffe9720c8ed05' 
  AND token = '1F8Dyi4XjoJMHUKMGDjL/ldFJbMAZ31UXb3o/biR0Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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