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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03220ede56d8b370667578942fe54683ce75686a757d767c59861e4056f86f62' 
  AND token = 'RTZD5kDSpnb7UFztERTbDwRL+dEA7rbIzV8PhtBv3nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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