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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18fc73793f8950565c48dff1c4128e27e0a32467493783a9337a8fbf579fc3aa' 
  AND token = 'jsA/1X/Z9gFlWm0cgWpBNDVaFRiOwLS9EjtTmcij54Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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