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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f576f00501e16809bf6ea394412a74160c9383401b3e9a2dd7788d3eab8de17' 
  AND token = 'jfBCtUCjH1Ro0olI1b6ANB6ddabNvMIWGVf5dVlIqFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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