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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b38d9ad4f5367910c1697cecc82b7dc0fa49ac6daebf46cb46a8f9c0415fb5d' 
  AND token = 'L0lWS4z9ISCh8515KxWPQ/xo53gip7La8dZqnlyVvq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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