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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf424b94499c6ab880fb36ad3d5a5bc286dbcde3b1711867b6e0d6a99db7faae' 
  AND token = 'hiu4kDWd5B8Rzs9akhU/bug9VJ6gPhuogY57YbiIPsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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