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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce306b5f1b1514fc14c240efb91fc7278ab27d096400af16813d922853b850b' 
  AND token = 'Foe+dxPBRhLv8Wx5Qt0mfj1tvbc5qzxE5e2Iz+fKLEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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