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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1526815db6d10423645a92fd661136c8501fa6f7c803cc1b3e27fcb5202817d' 
  AND token = 'hk5xGU/0ybkM7xh0tkrueTdkps4y5EI53Mt0f2GDhYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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