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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3e237398eaca34f3c65ae7dd122747c5b897c5e05ee06829f996b1d3c6e78b' 
  AND token = 'k8cH1CjcVqgeQNoSrMRBhCKA6A4zE5IUijDgTBG90ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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