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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718ab3ca4a77368956ca02aab7a3e1a015ead83600987bebfa4e0abb505fb540' 
  AND token = '1lL6TbwxKJCgw+RkNdQcGJfK3tI++pNF3YFK6EIa+ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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