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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a60f00f0f5108d6a9c3ae15f4a56ab0ded1a8f0caed83c3fe8e4a616a3e9c9' 
  AND token = 'n/uMZzaT0M4OKCDTro7GHWexGfqZeKWb9pX4GgInEuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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