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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcacf22e378fe3822fc33e5df972befca066ddf01e970e38acd5f277380c9eeb' 
  AND token = 'lrTh0muUb6fi/Cq/3CfJ9X/N/gqd6ajA6qsYK6mCq5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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