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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69068f20044c9c5bec1c08b0c17024a655740c1e2779c3b6e971e744924d3a8a' 
  AND token = 'QWb8IQSgJ4QET8GIX+myaG3oZ9MthYlU2tbWuh+Te+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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