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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b75f8249d60a67e3b255a78b6303b06b08174264e34111424f1d91715114586' 
  AND token = 'yBAP8g8Ag2JBHWwv4T/LyKCnO6IhJ6Wmg1rG2f0lBHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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