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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdee8bacd182b9d0f589f2a4ae07155d453695adaab6e515cb58169f5a839bc' 
  AND token = 'lbCDVNiF8xQhpzdPe3TJCVWbJYoLJWNek/ZVOxLTy2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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