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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28baa115f8201b30a894bbbd98dfbdd0025620d57a53e82f8c82cd83f203c2b' 
  AND token = 'SRhUOkozI/OpsZKH9VQE2kIlu07obwQ6VPxqfS6X7uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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