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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e45f2409e26ff30f5151f44a175ac1b3dd7e0171ce08cd87257d7ebe594a46' 
  AND token = 'uUTFaj5yVzpTfr2oGimkMyYmEueDo52TvZGNZ66qNRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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