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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8145fd59447fac747b03ca1484684a48eaa5148d2cab7332254dde9a7bf083c9' 
  AND token = 'opFrwyv+OuAx1Sl+HjhOomcXSXEkNxNzb7fCfmz+ERY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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