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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e53aa34ae10f4c36a36fc39a60a10e3d7a0ca4fa69a16dd9d6078891cf33fe' 
  AND token = 'XK+DTlG0gyyUsP8WNgheMr7e4634lKIgmxejxzhVb/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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