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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798ad8f22b2c9e6570b3c1ccfa1514085b9def35725fa0a11bfd6fcde47657a7' 
  AND token = 'nGvCaC442AsU/mpOUey7aDempLlfSznpZmUMbVo5dTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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