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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26fae65a329f5e035bd6e894fb73e145fda4c528f76e89577ed9ace1bb786656' 
  AND token = 'WDkddCfVv1Yfa+y2iL1pRT0oq5c+w4eK5AABsK5qfI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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