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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c062b8e748b0141c7614fa2de50b3c899cd36127321bb119df4b8807d8a82d' 
  AND token = 'xWQgnJVoT83sEa/V+bmJZF5ySEntkfoeUuUfMH93RPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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