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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96b421b201a397a359566ab8aa8aa9b7834517c976e74758bdaec08bbf3c70d' 
  AND token = 'Po6Mn66UqbPUYcoFVxP3QEqdVwhVZOKYNHY2Zlu00FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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