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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c613391b04a7e30260e0da6b7d07bb85a5575bfa16a0e0e750d11cabd6d5aaa' 
  AND token = 'hWTeG/zmXlQv6qRTV/Kbgb/Mvgqsox3T4ocSBQ9bN/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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