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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4c588951fd3dac861367e093789e9ca7b8ece63e9871ec232de79ba5f95b80' 
  AND token = '8nU3pSxLf70vjFeWefC52tLerQL0ldOFSSphUyzcTj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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