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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84be54806dbdb3b0a32e5612347d6b91616d60a95500e5becb6bcf4af7189c2' 
  AND token = 'ayeaYF6mbYN5L4HbhIuicVAhHYv4XN+WZpFNN6NRuxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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