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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0a684c43e9c552f35f62835ce265b44d95459f3c0ba0cb1ce8db0e4de18e19' 
  AND token = 'yzSK7+v4ZI8QEg+ajZawiz0sDYhekWHXcCCcfLP19NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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