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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa67b62bef6832a9cba5bf2e6f6c9d7792f7add3c0b7159e64bbcfc71186db38' 
  AND token = 'yEBjZ0Mw2Yjo4xntXmjGQBe5JZ/jkE5G0Mu9HibJ+Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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