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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19fa172497c764c8b418db5985075be4540d0ee2cdf4f39b25719ce9d2f6541f' 
  AND token = '4tl7eMBhakbJW9rMW7YCGR9a4ZYc5iuixLYCnfN4WvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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