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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a363d1f5b88a768ab6b8cb01e5869ac016ff6e97f9a5e83976b034f6f913795d' 
  AND token = '92M418EeGCB4ZVGBKlCOcTsHGS6YTueBDqQg2M5hayM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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