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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038ce66b9c129ba787476318da613c92455cf0e0e548188256605ddf576f685d' 
  AND token = 'Fqb5S1CE+QL8bPojj3qqJB5E3+Yyoaohwi4MYUTcHAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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