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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebed6cef0529d72c3600a0ea1e4938a6203e55bd39c9326dbb5182ddf2aefa76' 
  AND token = 'bMiKmUD0pnpt/MTt/h3mzQBH8EWpWVa3YPgdfG49pqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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