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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dcb05f4f95cedf3b33093a8a09a410f31f0c57120bdc4cf02aefd1d95fc99fd' 
  AND token = 'QS+C8S+WluM5VnED1Z1s53Cxyt8suqbj41dY2Kyxz30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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