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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1ff2ceafa3894ecf1fe37e86c9e33c6b5b9b19adb877d55ece8dd67c69c830' 
  AND token = 'MVnUTej9Q5kYbqd+Q5fMq9lElzoWoOGl/Lq+O3lttsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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