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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0127aac04997c416fcbc3718d544baca3b714a4562bc96159b6f13246669c966' 
  AND token = 'JcxiNlYRewYEIQlS4XWqQa9j67Kq3zeK73Mj2FC2qOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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