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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdaef1c99f083fe92e3ea82ddae80ee79a759fd0ca8b96cc1a275d879e0c59b9' 
  AND token = 'eJOUg8eIpRdBybM7IlFFPnmnE87ajHELgs1IB2FUSnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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