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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd25a8a68249cbb1a23b13804c99776ce472544445871dac94391eb1165ac566' 
  AND token = '9B605G9y0/uU8BIFxphh0zSfo1qhzFzmv9icERnjbV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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