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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf323c77b546f7d36a07e7d76dc10b51c20b5ed61b4f78213baa1aab6ead49d' 
  AND token = 'gfHd4MVeiPFEgEiWXZ//GAupZDcKzaDLi9aqL6MaeTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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