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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f8db087228e48a93c5560513a83df8201d925883a111cad8d77aa09911e6bb' 
  AND token = 'puFPBN/tOU+uz8s6u1FlxbarHEUTqqImp3ecGA8/EIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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