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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f349108332838f13d7b77f02d20216efdac80e79d41562c5b651123524a03478' 
  AND token = 'Fepzxg/HQMrFHJ+iI2Ou0p6HqLs0Vl3KyElyfnhibVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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