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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc074ce73cf4503aa676f43f8f58f2896695e7ccae39b8f76935e48aa98e3f2e' 
  AND token = 'WbtXZ8j9R9zb8by4dDtizK0KdAdH/j+FNp3DXO7TaGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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