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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b23b56c48846c9275bd1ca346953fac904fededeff7b2b2a98f88cf251a33ae' 
  AND token = '62KrGkDB5pcoNUHyg07hBdbLLiVMbb3OLIa9B7x32Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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