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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8c5f0f698c5c3c637a6965ce978af83eaa5111c175985ec6bf525204dd81de' 
  AND token = 'FU/YWlL0BZGUs0mt/5/iy4fcP/gBaDymWiVa3QNOqIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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