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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598399b7c8e443869ff269cdd8739db5154f5518efa62fe5bc4891ce79fb0163' 
  AND token = 'ZFVL5BWctFRMP2T0IdWrBktRYFuBC2QUjXDnY2Dq1fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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