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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651d96275bd55597fafdc8a8d8ea1f377d14056149fe1bfd65c7db6b5c434b0b' 
  AND token = '5Ea3zhudqb09yUwwi5e9x7JqPmgXHOHGxIDWgRAqZPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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