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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c466adccc37f61651421a5600d70630ce20f489118d712969538bc1b8eca14' 
  AND token = 'GIT3SEa8zwJWyipaEUL5qbApq/VXwx3XELyFptPhB8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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