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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b8a007e9109ce50c9596071478811cbe276c2f55630b00fdcb081d4a963caa' 
  AND token = '76f7abbtI9RGBLtXx+vw45JPzb/oyZTTiez92qErj+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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