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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc67d7c6fcdddc2195192db406fa8892852f3881e10f307879e010a02b9a2ca' 
  AND token = 'Y7cr6tnZYp7EJy3gQRp/0J7pe/isaX8zAtwi/KH2W+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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