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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa19bacddd139459c45b3b61f99487bbab49a3f82f772f5284e0e2a32329a4d' 
  AND token = 'AO8ASBAwVDBm8Dbxg7J/NSdNFU67Fnf8FsLS2JwO6nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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