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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a172629af5fc0d3f0151f31797b202f4f335df1cc42a086cf6964f524b2950e' 
  AND token = 'KRGuNyjf7LP66nysphUiEZrw40od+xqQcYmHIQmh3fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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