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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231e473b955db16dbc5f82b1e20fb0de8295cbac376413d9289ffe749ea8dfe5' 
  AND token = '4h4ZsPlNVvWKM8HmmyCwd0UEBN4yjZ8Pn6TnIZpd7y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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