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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190f495d7a9913ebbb25c64975f91fda4f0ab8db6c02ffa7e99f877c7532118c' 
  AND token = 'K/mecshuT6pAIZEaaRp5dkXPm+f9RRbNj/M02b2RnG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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