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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cc78b2790e7d460ba4839cdcac1b90376e0615b669783e9eb5afa0ef2589ea' 
  AND token = 'k/HmLudbJsKH3+jFWUk8nlCFiHcq6mJc8Pups2y6oWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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