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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88775d7b8f9798ea9b4601bc5a8a6caafe22396aa153b6a58fa6670900da6b0' 
  AND token = 'l8oBS14ko3N4qnktkhCrF8QoiRyvngv4t70EeoUd4WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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